title: 2-Hy-droxy-N'-methyl-5-nitro-benzohydrazide.
abstract: In the title compound, C8H9N3O4, there are two mol-ecules in the asymmetric unit, one of which is in the zwitterionic form. The zwitterion contains an intra-molecular N-H⋯O hydrogen bond and the other mol-ecule contains both an intra-molecular N-H⋯O and an intra-molecular O-H⋯O hydrogen bond. In the crystal, N-H⋯O and N-H⋯N hydrogen bonds link the mol-ecules, formimg a two-dimensional network parallel to (10-1).
authors.affiliation: College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074, People's Republic of China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.forename: Chengzhi
authors.initials: C
authors.lastname: Jin
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zhou
authors.forename: Longfei
authors.initials: L
authors.lastname: Jin